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→Override system of system scroll speed
The ratio can be specified by hidden prefs. '''mousewheel.system_scroll_override_on_root_content.vertical.factor''' is for vertical scrolling event. '''mousewheel.system_scroll_override_on_root_content.horizontal.factor''' is for horizontal scrolling event. The values are used as 1/100 (i.e., the default value 200 means 2.0).
nsEventStateManager multiplies the scrolling speed by the ratio when actually it executes to scroll a target. So, DOMMouseScroll event's delta value has never been overridden overwritten by this.
See also [https://bugzilla.mozilla.org/show_bug.cgi?id=513817 bug 513817].
